Full-Spectrum Flexible Color Printing at the Diffraction Limit

Richner, Patrizia; Galliker, Patrick; Lendenmann, Tobias; Kress, Stephan J. P.; Kim, David K.; Norris, David J.; Poulikakos, Dimos

doi:10.1021/acsphotonics.6b00131

Cited by 30 publications

(26 citation statements)

References 24 publications

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“…In the following, we studied larger devices with 5 µm wide and 50 µm long graphene channels to explore the detector performance. Nanoprinting of various inks containing metallic nanoparticles and QDs for a host of applications has already been demonstrated . Recent years have accumulated knowledge on the effect of ink properties and substrate wettability both influencing printing behavior and printing resolution .…”

mentioning

confidence: 99%

Nanoprinted Quantum Dot–Graphene Photodetectors

Grotevent

Hail

Yakunin

et al. 2019

Advanced Optical Materials

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State-of-the-art semiconductor-based infrared photodetectors such as epitaxially grown InGaAs and HgCdTe are expensive, not readily compatible with complementary metal-oxidesemiconductor fabrication, require sophisticated processing, Photodetectors utilizing graphene field-effect transistors sensitized by colloidal quantum dots exhibit high responsivities under infrared light illumination. Precise, microscopic spatial control over quantum dot deposition is required to gain deeper insight into device mechanisms, optimize device performance, and enable new device architectures and applications. The latter may eventually include photodetectors with subwavelength device dimensions. Here, infrared photodetectors are fabricated by electrohydrodynamic nanoprinting of colloidal PbS quantum dots onto graphene field-effect transistors with varying quantum dot layer thicknesses on a single substrate, demonstrating the potential of the method for realizing small footprint detectors with high spatial resolution. Remarkably, while the responsivity of the photodetectors increases with increasing layer thicknesses up to 130 nm, the noise current is found to be independent of the layer thickness. In addition, the responsivity and noise current are both linearly dependent on the applied drain voltage and drain current. As a result, the specific detectivity is independent of the drain voltage, and the detector can be operated at lower drain voltages thus reducing power consumption. Finally, specific detectivities of at least 10 9 Jones at 1200 nm are obtained, without degradation of the charge carrier mobilities in graphene from the electrohydrodynamic printing.

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mentioning

confidence: 99%

Nanoprinted Quantum Dot–Graphene Photodetectors

Grotevent

Hail

Yakunin

et al. 2019

Advanced Optical Materials

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“…As long as appropriate measures are taken, we believe that DIW, EHD printing and electrophoretic deposition can also be applied to other standard metallic nanoparticles such as Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Sn, Sb, Re, W, Pt, Au, Bi and Ir . In addition to metallic nanoparticles, the range of non‐metallic and organic particles is vast and also accessible to nanoparticle‐based AM techniques . A route to significantly increase the range of metallic elements would be the use of metal oxide nanoparticles combined with subsequent annealing in a reducing atmosphere.…”

Section: Discussionmentioning

confidence: 99%

Additive Manufacturing of Metal Structures at the Micrometer Scale

et al. 2017

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Currently, the focus of additive manufacturing (AM) is shifting from simple prototyping to actual production. One driving factor of this process is the ability of AM to build geometries that are not accessible by subtractive fabrication techniques. While these techniques often call for a geometry that is easiest to manufacture, AM enables the geometry required for best performance to be built by freeing the design process from restrictions imposed by traditional machining. At the micrometer scale, the design limitations of standard fabrication techniques are even more severe. Microscale AM thus holds great potential, as confirmed by the rapid success of commercial micro-stereolithography tools as an enabling technology for a broad range of scientific applications. For metals, however, there is still no established AM solution at small scales. To tackle the limited resolution of standard metal AM methods (a few tens of micrometers at best), various new techniques aimed at the micrometer scale and below are presently under development. Here, we review these recent efforts. Specifically, we feature the techniques of direct ink writing, electrohydrodynamic printing, laser-assisted electrophoretic deposition, laser-induced forward transfer, local electroplating methods, laser-induced photoreduction and focused electron or ion beam induced deposition. Although these methods have proven to facilitate the AM of metals with feature sizes in the range of 0.1-10 µm, they are still in a prototype stage and their potential is not fully explored yet. For instance, comprehensive studies of material availability and material properties are often lacking, yet compulsory for actual applications. We address these items while critically discussing and comparing the potential of current microscale metal AM techniques.

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Section: Printing Approachesmentioning

confidence: 99%

“…As shown in Figure c, this printing method utilizes a jet with a much smaller orifice (about 1–5 µm) and the DC bias between the nozzle and the substrate generates droplets 10 times smaller than the opening. Richner et al obtained a multicolor image at the diffraction limit (resolution 250 nm) across a large scale (Figure d) . By controlling parameters including magnitude of the bias, moving speed of nozzle and number of overprints, the size and fluorescence intensity could be manipulated .…”

Section: Printing Approachesmentioning

confidence: 99%

Composite Structures with Emissive Quantum Dots for Light Enhancement

Smith

Lin

et al. 2018

Advanced Optical Materials

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The optical properties of these nanostructures can be controlled via precise control of the synthetic parameters resulting in a wide range of chemical compositions, shapes, and dimensions. QDs are quite advantageous in comparison to traditional organic dye counterparts, offering size, and composition dependent energy band gaps (i.e., tunable absorption and photoluminescence), prospective excellent photostability, and solution and aqueous processability based on choice of surface chemistries. [2] Intense research in this field in the past two decades has focused on precisely engineering core-shell composition of QD nanostructures resulting in an appreciable impact on the field of photonic materials and structures to develop composite nanomaterials with precise control of refractive index, permittivity, and permeability.QDs are the promising candidate to control interactions in photonic systems in many respects due to their enhanced photostability, near 100% quantum yield, and versatile surface chemistry. More recently, facile synthetic techniques for large-scale high-quality production have been introduced that involve wet chemical processes to expand applicability of these components in light-managements devices. [5][6][7] However, the overall processability and scalability of these components into robust large-area structures are still a critical concern limiting real-life implementation in robust designs. While there are many techniques to produce QDs, common limitations for this class of nanomaterials are low quantity, large dispersibility in size, compositional nonuniformity, and the presence of excess passive components resulting from wet chemistry synthetic procedures (e.g., ligands).Providing a convenient host matrix not only overcomes some of these common limitations but allows for QDs to be used in more technologically exploitable forms such as robust, flexible, mechanically and chemically stable fibers, coatings, films, and patterns. [8] For such composite systems, inclusion of nanoparticles into sophisticated matrices typically results in the significant improvements of thermal, mechanical, electrical, and optical stabilities making them more applicable in device environment than other traditional organic materials.While the concept of embedding various nanostructures into different surrounding materials is not new, synthetic techniques required to combine these can be rather complex. Most Since their inception, quantum dots have proven to be advantageous for light management applications due to their high brightness and wellcontrolled absorption, scattering, and emission properties. As quantum dots become commercially available at large scale, the need for robust, stable, and flexible optical components continues to drive the development of robust and flexible quantum dot composite materials. In this review, after a thorough introduction to quantum dots, discussion delves into methods for fabricating quantum dot loaded composite optical elements such as thin films, microfabricated patterns, and micros...

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Full-Spectrum Flexible Color Printing at the Diffraction Limit

Cited by 30 publications

References 24 publications

Nanoprinted Quantum Dot–Graphene Photodetectors

Nanoprinted Quantum Dot–Graphene Photodetectors

Additive Manufacturing of Metal Structures at the Micrometer Scale

Composite Structures with Emissive Quantum Dots for Light Enhancement

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